Heat treatment of alloy steel 30CrMo plate

The alloy steel 30CrMo plate is chrome molybdenum steel. It is Chinese steel grade, and equivalent to Japan SCM430.

Heat treatment of alloy steel 30CrMo plate:
Annealing No.1 "annealing at 760 ± 10℃, furnace cooling to 400℃, air cooling. HB220-230.
Normalize No.4 860 ± 10℃ and air cooling.

Quenching and tempering No.5 840 ± 10℃ by water or oil (depending on the complexity of product shape), tempering at 680-700 degrees. HB<217.
Quenching and tempering No.6 840 ± 10℃ oil quenching and tempering at 470℃. HRC 41-45.
Quenching and tempering No.7 840 ± 10℃ oil quenching and tempering at 480℃. HRC 35-45.
Quenching and tempering No.8, quenching at 850℃ and tempering at 510℃. HRC 38-42.
Quenching and tempering No.9, quenching at 850℃ and tempering at 500℃. HRC 40-43.
Quenching and tempering No.10, quenching at 850℃ and tempering at 510℃. HRC 36-42.
No.11 was quenched and tempered at 850℃ and tempered at 560℃. HRC 32-36.
Quenching and tempering No.12, quenching oil at 860℃ and tempering at 390℃. HRC 48-52.